2017, Volume 9, Issue 3

Kinematic analysis of the block start and 20-metre acceleration phase in two highly-trained sprinters: A case report



Michał Janowski1, Jacek Zieliński1, Michał Włodarczyk1, Krzysztof Kusy1

1Department of Athletics, Poznan University of Physical Education


Author for correspondence: Michał Janowski; Department of Athletics, Poznan University of Physical Education; email: mjanowski[at]awf.poznan.pl

DOI: 10.29359/BJHPA.09.3.02

Full text

Abstract

Background: The main purpose was to evaluate individual kinematic characteristics in highly trained sprinters during the „set” position, block clearance and a 20-m acceleration phase, as well as to determine differences and/or technique similarities.
Material/Methods: The measurements were carried out on two sprinters, members of the Polish national team. A wireless portable MyoMotion system (Noraxon Inc., USA) was applied. Angular changes and accelerations of all limbs, trunk and head were measured.
Results: Increased motion asymmetry between sides brought about stride fluctuation and worsened sprint performance. This effect occurred when the sum of the discrepancies for hip, knee and ankle joints exceeded 20° or if one joint exceeded 10°. For acceleration, the adverse effect occurred when the range exceeded 1.40 G during the acceleration phase. Greater asymmetry resulted in lower acceleration during block clearance. During block clearance rear hip and right knee angles did not exceed 110º and 100°, respectively, in the best attempts. The „set” position seemed to have little impact on performance.
Conclusions: Sprinters exhibit individual kinematic characteristics. Fast block clearance and stride symmetry are key factors affecting sprint performance during the 20-metres acceleration phase. Additional research is necessary to determine the most effective pattern.


Key words: biomechanics, motion analysis, acceleration, stride symmetry, block clearance, \"set\" position


Cite this article as:

AMA:

Janowski M, Zieliński J, Włodarczyk M et al. Kinematic analysis of the block start and 20-metre acceleration phase in two highly-trained sprinters: A case report. Balt J Health Phys Activ. 2017;9(3):18-32. doi:10.29359/BJHPA.09.3.02

APA:

Janowski, M., Zieliński, J., Włodarczyk, M., & Kusy, K. (2017). Kinematic analysis of the block start and 20-metre acceleration phase in two highly-trained sprinters: A case report. Balt J Health Phys Activ, 9(3), 18-32. https://doi.org/10.29359/BJHPA.09.3.02

Chicago:

Janowski, Michał, Zieliński Jacek, Włodarczyk Michał, Kusy Krzysztof. 2017. "Kinematic analysis of the block start and 20-metre acceleration phase in two highly-trained sprinters: A case report". Balt J Health Phys Activ 9 (3): 18-32. doi:10.29359/BJHPA.09.3.02

Harvard:

Janowski, M., Zieliński, J., Włodarczyk, M., and Kusy, K. (2017). Kinematic analysis of the block start and 20-metre acceleration phase in two highly-trained sprinters: A case report. Balt J Health Phys Activ, 9(3), pp.18-32. https://doi.org/10.29359/BJHPA.09.3.02

MLA:

Kusy, Krzysztof et al. "Kinematic analysis of the block start and 20-metre acceleration phase in two highly-trained sprinters: A case report." Balt J Health Phys Activ, vol. 9, no. 3, 2017, pp. 18-32. doi:10.29359/BJHPA.09.3.02

Vancouver:

Janowski M, Zieliński J, Włodarczyk M et al. Kinematic analysis of the block start and 20-metre acceleration phase in two highly-trained sprinters: A case report. Balt J Health Phys Activ 2017; 9(3): 18-32. Available from: doi:10.29359/BJHPA.09.3.02